Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting (XSS) Vulnerability
n/a — n/a
Cross Site Scripting vulnerability in Zimbra ZCS v.8.8.15 allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.
9.0
77.3%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- Required
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
- Published
- Jul 6, 2023
- Modified
- Oct 21, 2025
- Added to KEV
- Feb 25, 2025
- Federal patch due
- Mar 18, 2025
CISA required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Weakness classification
Proof-of-concept & exploitation references
Weaponization
Public repositories whose name or description references CVE-2023-34192, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit - cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
No public GitHub repositories referencing CVE-2023-34192 were found at last check. Absence here is not proof no exploit exists - see the references below for vendor advisories and write-ups.
References
Frequently asked questions
What is CVE-2023-34192?
Cross Site Scripting vulnerability in Zimbra ZCS v.8.8.15 allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function.
How severe is CVE-2023-34192?
CVE-2023-34192 has a CVSS base score of 9.0 out of 10 (CVSS 3.1).
Is CVE-2023-34192 actively exploited in the wild?
Yes. CVE-2023-34192 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Feb 25, 2025, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2023-34192?
77.3% - meaning FIRST.org's EPSS model estimates a 77.3% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2023-34192?
Yes - a public Nuclei template referencing CVE-2023-34192 exist in public repositories we checked.
What type of vulnerability is CVE-2023-34192?
CVE-2023-34192 is classified under CWE-79 (CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')).
Cross-checked against
Impactr finds and proves whether CVE-2023-34192 - or flaws like it - are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.
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